Solved

No research

What did you try to do?
Research acceleration at 91%, as CD strength.

What happened instead?
I received no DP.

Did the problem happen while using wi-fi, mobile data, or both?
Both

Did the bug happen in the app, on PC, or both?
Both

What is the model of your device?
Game issue

What is the operating system?
Android

What is the version number of the operating system?
Game issue

What operating system is your PC?
Game issue

Which browser did you experience the problem in?
Game issue

Can the bug be reproduced?
? I don't know... Maybe, maybe not.

Additional comments:
I levelled up twice during the race, now my research is 81% and this is what my car looks like now.

Anyone?

They don’t often reply on the weekends :(

I know, next race already happened so goodbye DP I suppose

Thanks kevin.

Hello Rhys 

I'm sorry about that. I will forward what happened to the team for further testing and solutions.
Unfortunately I can't give you the search points in that skill because I saw that you have done research by increasing your points. 
I have increased your research at 91% in another area (Handling) .
I hope this will partly compensate for the inconvenience.

Thanks bruno